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An extensive nine-month refit last year included upgrades and an Operational Sea Training programme, before she went back out to sea.
Captain Iain Lower, Dragon's commanding officer, said in a terse statement: "Since leaving the builder's yard in Scotstoun nearly two years ago and through intense combat system and propulsion trials and operational sea training our focus has been about this moment".
It has been a long journey since our Operational Sea Training in February and we are looking forward to being re-united with our families before Christmas.
It also provides support for ships undertaking Operational Sea Training, other ships of the Fleet and other foreign navies.
Its extensive nine-month regeneration included refits, upgrades and an Operational Sea Training programme.
Preparations for the deployment have included extensive training culminating in an eight-week operational sea training course which the ship and crew passed in November.
The ship was due to sail out on operational sea training at 12pm today, but before she went David Williams, a ship manager at Cammell Laird, who built the vessel, took one last look around before she is decommissioned next year.
Capt Chick added: "HMS Illustrious has been very busy over the last month, conducting operational sea training to maintain our ability to deploy globally at short notice.